.login{
    
   position: absolute;  /* 绝对定位 */
   left:0;
   top:0; 
   bottom: 0;
   right:0;
   background: url('../../assets/login.png');
   background-position: center center;
   background-size: cover;
}
.login-container{
    width:440px;
    height:360px;
     position:absolute; /*绝对定位脱离文档流 */
    left:50%;
    top:50%;
    transform: translate(-50%,-50%);
    box-shadow:0 0 50px rgb(0,0,0,0.5)
}
.login-logo{
    width:60px;
    display:block;
    margin: 0 auto 20px;
}